Spy School Goes South by Stuart Gibbs

This book is about Ben Ripley, a spy in training, who goes on a mission to figure out where all of the SPYDER agents are located. Ben's nemesis, Murray Hill, who they just captured, decides that he will show where everyone is located. But, Murray tells them that he will only show Ben where until he and a friend of Ben's, Erica Hale, board the plane to the different locations. It turns out that this was all a trap and they have to work their way from the middle of Mexico to figure everything out. Will they succeed?